Electric control system for hosiery treating machines



4 Shee'ts-Sheet l W. M. SCHWARTZ Filed April 4, 1940 Oct. 13, 1942.

Oct. 13, 1942- w. M. SCHWARTZ ELECTRIC CONTROL SYSTEM FOR HOSIERY TREATING MACHINES Filed April 4, 1940 4 Sheets-Sheet 2 2 2% g kv ww s. haw

Oct. 13, 1942. w. M. SCHWARTZ 2,299,041

ELECTRIC CONTROL SYSTEM FOR HOSIERY TREATING MACHINES Filed April 4, 1940 4 Sheets-Sheet 3 Oct. 13, 1942. w. M; SCHWARTZ 2,299,041

ELECTRIC CONTROL SYSTEM FOR HOSIERY TREATING MACHINES Filed April 4, 1940 '4 Sheets-Sheet 4 Ill Patented Oct. 13, 1942 ELECTRIC CONTROL SYSTEM FOR HOSIERY TREATING MACHINES Walter M. Schwartz, Philadelphia, la., asslgnor to Proctor J; Schwartz, Incorporated, Philadelphia, Pa., a corporation of Pennsylvania Application April 4, 1940, Serial No. 327,900

16 Claims. (Cl. 223-76) This invention relates to industrial control circuits; and particularly to an electrical circuit employed in connection with a machine for treating hosiery or other textile articles mounted on suitable supporting forms, as disclosed in the copending application, Serial No. 327,086, filed March 30, 1940, or kindred apparatus.

The principal object of the present invention is to correlate or coordinate a number of individual and/or interrelated operations of the machine for the purpose of automatically efiecting an overlapping of the time periods normally necessary for carrying out each operation individually, and to automatically start and stop such operations in predetermined order or sequence, so as to avoid loss of time in effecting a complete cycle of operations of the machine.

Another object of the invention is to provide safety features in the circuit which will prevent injury to the operator, the machine, and/or the articles being treated in or by the machine during operation thereof.

In the accompanying drawings:

Fig. 1 is a side elevation of the machine;

Fig. 2 is a sectional plan view taken on the line 2-2, Fig. 1;

Fig. 3 is a diagrammatic plan view of the base portion of the machine and illustrates relative locations of various control switches employed in the circuit;

Fig. 4 is a sectional elevation taken on the line l4, Fig. 3; and

Fig. 5 illustrates the circuit in conventional diagrammatic form.

The specific machine for which the circuit of the present case has been particularly developed, as disclosed in the above noted copending application, involves steaming of hosiery or other fabricated articles while mounted on forms enclosed within a dome or bell-shaped chamber. The steaming chamber is movable vertically from its form-enclosing position to a position above the tops of a group of forms vertically aligned therewith, and vice versa.

Steam is admitted to the chamber as it is moved into its low position to enclose the group of forms; and is subsequently exhausted from the chamber, prior to the raising of the chamber to its high position, clear of the tops of the forms, to expose said group of forms.

The raising and lowering of the chamber is accomplished by a reversible electric motor, which lowers the chamber under power until the base structure and forms a fluid-tight seal thereployed and each group is mounted on a separate turntable. The turntables are respectively mounted on a pair of trucks. These trucks are selectively movable, along horizontal rails beneath the raised chamber, from a strippin and loading position, at an operator's station remotely situated with respect to the compass of the dome or chamber, into position in vertical alignment with the raised chamber, and vice versa.

Should misalignment of the truck occur, or until proper alignment is effected, a safety switch in the 'chamber actuating motor circuit holds the circuit open or opens it, to prevent or stop lowering of the chamber until correct alignment is obtained.

When either truck is moved from alignment with the chamber to either of the two operator's stations respectively located on opposite sides of the chamber, driving means for the turntable, which is carried by the particular truck then located at the operator's station, is brought into operative relation with respect to driving means which is mounted in a fixed position at the operator's station. A single motor is provided for simultaneously actuating both driving mechanisms respectively located at the two operators stations. However, either truck when in alignment with the chamber is disconnected from the turntable driving means at the operator's station from which that particular truck has been moved.

The turntable carried by the truck which is located at the operators station, while the other truck is enclosed within the chamber, is caused to rotate intermittently by the single motor above noted, after the motor has been energized by operation of a manual switch at the operator's station. Intermittent rotation of the turntable brings the article laden forms of the group carried thereby into a definite position successively,

lower edge h re f J m ly inst a rigid for the operator to strip the previously treated articlestherefrom and to place untreated articles thereon.

Each turntable acts as an electrical timing device and is provided with a plurality of buttons or pins which, at predetermined times during a single revolution of the turntable, actuate switches to shut oil! the supply of steam to the chamber, subsequently initiate raising of the chamber, and finally eflect stopping of the turntable itself.

The steam is admitted to the chamber through an electrically controlled valve which is operated by the chamber itself just prior to the stalling of the chamber lowering motor,'through actuation thereby of a switch located in the path of downward movement of the chamber. This switch, in turn, closes the circuit to the electrically operated steam valve. The steam valve is subsequently opened by one of the pins or buttons on the turntable, as previously noted.

A time relay is embodied in the circut to delay the raising of the chamber for a predetermined length of time after the electrically controlled steam valve has been actuated to shut off the supply of steam to the chamber and throw the chamber open to exhaust, to prevent steam under pressure escaping from the chamber and injuring the operator or other persons in the vicinity, should an attempt be made to hasten the raising of the steam chamber by operation of a manual switch incorporated in the circuit forindependently raising the chamber out of its order of sequence with the other operations of the machine, should such independent or oil-time operation be necessary.

As shown in the drawings, the machine comprises a general framework I which includes a tower 3 for rotatably supporting jack screws I for raising, lowering, and guiding the pressure chamber I with respect to a solid rigid' base also forming part of the general framework of the machine. Through suitable worm gearing II enclosed within gear boxes or pedestals 2, one at each side of the machine, the jack screws 1 are rotated, first in one direction and then in the opposite direction, selectively, by a reversible electric motor I2.

The steam valve for admitting steam under pressure and exhausting steam from the interior of the chamber I0 is indicated at 85. Any suitable three-way valve of the rotary or reciprocating type, operable in one direction by a solenoid or other electrically actuated device to admit steam to the chamber I0, and in the opposite direction by gravity or spring tension to exhaust steam from said chamber, may be employed; and, as an example, reference is made to the valve disclosed in detail in the above noted copending application as being the type preferred.

The two trucks for supporting the two groups 25, 25 respectively of the hosiery supporting forms, 24, 24 are indicated at 50, 50, the one being enclosed with the chamber II), as shown in Fig. 1, while the second is disposed at the left hand remotely disposed operators station A.

The turntables which support the forms 24, 24 are indicated at 35, 35 respectively. The tumtable on the truck 50 located at either one of the operators stations A is driven by a motor 66, through a shaft 55, a gear box 64, a vertical shaft 62, and a. gear GI disposed at the upper end of the shaft-62. The gear BI disengageably intermeshes with a gear 60 which is carried by the truck 50 and is operatively connected to the turntable 30 in any suitable manner to effect intermittent rotation of the turntable, while the shaft 02 is constantly rotated, as bya pawl and ratchet mechanism operable by a crank on or driven by the gear 60, or by a well known Geneva/F movement similar to that disclosed in detail in the above noted copending application.

The sequence of operations is as follows: Let it be assumed that one truck 00 and its articleladen forms 24, 24 are enclosed within the chamber I0, with steam being admitted to said chamber l0; and the second truck 00, with its group of forms, is in position at the operators station A. The first board or form 24 of the exposed group carried by the truck 50, which is then located at the operator's station A, is in position to be stripped and reloaded. The motors 00 and I2 are stopped.

Included in the circuit for the motor 60, (see Fig. 5) is a pair of two-position switches I09, I09, each biased to one of its positions, as shown in Fig. 5; and a pair of normally closed switches I20, I20. When a truck 50 is moved into position at one of the operators stations it opens one of the switches I20. Consequently when the operator moves one truck 00 from under the raised chamber I0 into one operators station, and before he moves the other truck fromthe second operators station into position below the raised chamber I0, both switches I20, I20 are open. Then, when the operator moves one of the trucks into position below the raised chamber I0 the switch I20 controlled thereby automatically closes but the switch I20 controlled by the other truck still remains open and keeps the circuit to the motor 00 open, hence the motor 08 remains inoperative during shifting of the trucks in the manner noted.

The operator proceeds to strip a previously treated article from the first form, marked a, on the truck at the operators stations and then presses one of the manual switches I09 to close a circuit around the open switch I20 to energize and run the motor 08 until it moves the tumtable 35 a sufllcient distance to release the switch I20 controlled thereby, permitting this switch to return to its normal circuit closing position, whereupon the operator releases the switch I09 permitting it to return to its normal circuit closing position, after which the motor it continues to run and intermittently rotate the turntable 35.

When the 16th form of the exposed group 25 arrives at the operators station A, a low pin III (see Fig. 2) carried by the turntable 35 of the exposed truck 50 engages the lowermost lever I I2 of a pair including a second superposed lever II4 on the framework I. Rocking of the lever II: operates a normally closed switch IIO. This opens the circuit to the solenoid winding of the steam valve 85, causing the flow of live steam to the interior of the chamber I0 to be discontinued and said interior to be opened to exhaust.

When the 20th form of the exposed group 25 arrives at the operators station A, a high pin II3 on the turntable 35 engages the second lever I I 4 of the superposed pair I I2I I4 on the framework I. Rocking of the lever II4 operates a normally open switch III, to close the circuit to th elevating-screw motor I2.

Incidentally the pin I I3, in operating the lever II4 also operates the lever II2 again, but as the first operation of the lever II2 has accomplished its purpose the second incidental operation of said lever is ineffective.

Between the time the switch H0 is opened to deenergize the winding 08 of the steam valve 08 and they time the switch II! is closed to eflect raising of the chamber l by the motor I2 the circuit to the motor I2 remains open until such time as the pressure of the steam within the chamber I0 has been exhausted sufliciently to reduce its pressure and volume to a point where it would be harmless if permitted to escape to the atmosphere surrounding the machine as by prematurely raising the chamber I0.

OIf-time raising of the chamber I0 might be effected by indiscriminately closing a manually operable switch IIa. which is included in the circuit as a means for intentionally eflecting raising of the chamber out of its normal sequence in the operation of the machine should occasion arise.

The switch I I5a is of the two-position type biased to one of its positions as shown in Fig. 5. This switch and each of the other similarly represented switches, may take the form of a springbiased push-button switch.

The normally closed contacts II5b, I lib, of the switch II5a are included in the portion of the circuit for controlling the lowering of the chamber I0 by the motor I2, thus when the switch Ilia is moved to position across the contacts 'II5c, Ilic, which are in the portion of the circuit for controlling the raising of the chamber I0 by the motor I2, the switch II5a serves as a means to prevent simultaneous closure of the raising and lowering circuits for the chamber I0.

Also included in the control circuit for the motor I2, is a centering switch I03 which is normally open and is closed only by a truck 50 when moved into and retained in proper axially aligned relationshipto the chamber I0. This is accomplished by a pin I04, which projects downwardly from the underside of each truck 50, engaging a lever I05 which lies in a horizontal plane above the base I. The lever I05 is connected by suitable linkage to the switch I03, which latter is normally biased by a spring into its open circuit position.

After the motor I2 starts to raise the chamber I0, it continues in operation until the lower edge of the chamber I0 reaches an elevation above the tips 24a of the forms 24 enclosed within the chamber, and as the maximum high position of the chamber is attained thereby, it automatically operates a limit switch I", included in the raising control circuit, to open said circuit and thereby stop the operation of the motor I2.

From the time of initial operation of the manual switch I09, to start the turntable 35, and during the exhaustion of the steam from the chamber I0 and the raising of the chamber, the turntable 35 of the exposed group of forms 24 at the operator's station A continues to rotate intermittently, each form stopping at the station A for a sufficient length of time to permit the operator to strip one article from the form and place another article'thereon.

When the last or 24th form of the exposed group arrives at the operator's station A, a pin or other projection I I8 carried by the exposed tumtable 35 engages a plunger I I9 and opens a switch I20 in the circuit for the motor 66, thereby stopping the operation of this motor and the rotation of the turntable 35 as a result thereof.

The turntable 35 remains in this position relative to the plunger I9 during movement of the truck 50 from the operators station into alignment with the chamber I0 and during return of the truck to the operators station. As the truck leaves the operator's station the plunger II! releases the switch I20 but as soon as the truck returns to the operator's station the plunger II. again operates the switch I20 into circuit opening position, thus requiring the operator to hold in the starting switch I00, to begin rotation of the turntable 25, as described above.

After the turntable stops, the operator moves the truck 50, which is then axially aligned with the raised chamber I0, from beneath said chamber into position at the right hand operator's station A1, as viewed in Fig. 1. In so doing the gear 60, carried by that particular truck 50, is brought into operative engagement with the turntable driving gear SI at the right hand station A1.

The operator then moves the reloaded truck 50 from the left hand station A into vertical alignment with the raised chamber l0, and in so doing effects closing of one of the centering switch I02, included in the lowering control circuit for the motor I2, which starts rotation of the motor I2 in the opposite direction and starts the chamber I0 downwardly about the group of forms then axially aligned therewith.

The first portion of the downward movement of the chamber I0 releases the limit switch II! and resets it for the next upward movement of said chamber. v

The downward movement of the chamber I0 continues until the lower edge thereof closely approaches the base I. Just prior to the sealing of the lower edge of the chamber I0 against the base I, said chamber operates a normally open switch I08, to close said switch momentarily to effect energization of 9. 0011.2 of a relay 2l0, through which the winding 95 of the steam valve is energized to operate said valve from its exhaust position to its steam inlet position, for starting and continuing admission of steam to the interior of the chamber I0.

Between the momentary operation of the switch I08 and the actual admission of steam to the interior of the chamber I0, the motor I2 completes the movement of the chamber I0 into sealing contact with the underlying base I, and continues to operate to jam the chamber I0 tightly down on the base I to produce a fluidtight seal therebetween, and until the motor actually stalls by overload created by said jamming of the chamber I0 down on the base I. Such overloading of the motor I2 causes opening of overload relays I01 in the motor circuit, whereby operation of the motor I2 is stopped. It will be understood that the relays I01 are not energized by normal current or load but are energized whenever the magnitude of the current drawn by the motor I2 reaches a predetermined abnormal value.

This completes one cycle of operation of the machine and sets the machine up for the beginning of the next cycle, with the form a of the exposed group located at the right-hand operators station A1 in position to be stripped and reloaded by the operator, prior to the operator closing the manual switch I09 at that station to start the mechanical sequence of operations above noted.

The circuit disclosed in Fig. 5 is of the type generally referred to as a "three-phase alternating current circuit. However, it'will be understood that a two-phase A. C. or a direct current?- circuit may be employed without departing from the spirit of the invention.

The "three-phase A. C. circuit illustrated includes main power lines 1:, u and 2 respectively, which are connected to the motor I2 in the usual ordinary well known manner.

A gang switch 2 I2 is included in the power lines a, u and z for completely disconnecting the electrical apparatus from the source of electrical energy when desired.

A branch power circuit, including power lines .rI, yI, zI is shunted around a relay H having contacts 2I3, 2I4 and 2I5 for opening and closing the lines y and 2 respectively.

The branch or shunt circuit embodying the power lines at, y and 2, includes a relay L hav- 4 ing contacts 2I3a, 2I4a and 2I5a for opening and closing the power lines 3:, 1 2' respectively. It will be noted that a reversal in the direction of operation of motor I2 is effected through lines :2, y and 2' by reversal of two of the phases of the three phase supply line, as well understood by those skilled in the art.

The relays H and L govern the hoisting and the lowering of the chamber I0 and are so correlated as to form an electrical interlock, whereby the hoisting circuit is rendered and maintained ineffective during lowering of the chamber I0, and whereby the lowering circuit is rendered ineflec' tive during the hoisting of said chamber.

After the operator moves one of the trucks 00 into vertical alignment with the raised chamber I0, and thereby operates one of the switches I03- into circuit closing position, operation of the manual switch I02 into circuit closing position across the terminals I21; and I02b causes current to flow from power line 3: through a conductor 2I6, one of the centering switches I03, and a conductor 2 Ilia to one side of a coil 2II of the relay L; thence, from the second side of the coil 2 I I through a conductor 2I6b, normally closed contacts 2I8, a conductor 2I6c, the normally closed contacts of overload relays I01, I01, and con ductor 2I6d to the terminal I02a of the switch I02. The movable element I020 of the switch I02 is connected to conductor 2I0c by a conductor 2I6n, to by-pass the overload relays I01 and thus maintain the circuit in the event that one or both of the relays I01 should be energized by the starting current drawn by the motor I2.

The terminal l02b of the switch I02, is connected to the line 2 by a conductor 2I9, normally closed manual interrupting switch IIIid, conductor 2| 9a, switch So and its contacts IISb, Ilib and conductor 2I9b.

Closing of the switch I02, therefore, energizes the coil 2 I I of the lowering relay L which in turn actuates the contactors 2I3a, 2Ila, and 2I5a, closing the lines 12:, y, z, to the motor I2, which starts said motor to lower the chamber I 0.

Relay L locks itself in through contacts 220 which ar shunted across switch I02, thus maintaining the lowering control circuit after the switch I02 is released. Relay L also opens its interlock contacts 225 to prevent closure of the hoisting control circuit.

As the chamber I0 approaches its maximum low position, it engages and momentarily closes the switch I08, one side of which is connected by a conductor 2I9d to the conductor 2I0. The second side of the switch I08 is connected by a conductor 2I6f, through the coil 2 of relay 2I0 and the normally closed switches H0, H0 to the conductor 2I6.

Closing of the switch I00 energizes the coil 2 and operates the relay 2 I0 to clos the normally open contacts 22I and 222, and to open the normally closed contacts 223,

The contacts 22 I serve to lock the ,relay in after the switch I08 is opened.

Closing of the contacts 222 causes current to flow from the conductor 2I3 through 2I0d, 2I0e, contacts 222, conductors 2I0g and the coil 33 of the steam valve 05 and conductor 2 I6, thereby operating said valve into and holding it in position to admit live steam to the chamber I0.

The motor I2 continues to operate to form the seal between the lower edge of the chamber II and the base I, which eventually places an overload on the motor. This overload causes a heavy surge of current in the coil 224 of one or the other of the overload relays I01, whereupon said relay opens the circuit through the coil 2I'I of the relay L, thus opening the contacts 2I3a, Illa and 2 I5a to open the power lines 2:, u and z to the motor I2.

When the 16th form of the exposed group arrives at the position to be stripped and reloaded, by intermittent rotation of the turntable 35 carrying the exposed group of forms one of the switches H0 is opened and. causes deenergization of the coil 2 of the relay 2I0, whereupon the contacts 2 and 222 are reopened and the contacts 223 are closed.

Opening of the contacts 222 deenergizes the coil of the steam valve 05, throwing the interior of the chamber I0 open to exhaust at the same time as the flow of live steam to the interior of the chamber I0 is stopped.

Closing of the contacts 223 permits current to flow from the conductor 2l6 through 2I0h, contacts 223, conductor 216i, switch 220 of the time relay 200, heating coil'229 of said relay, and conductor 2I0 to conductor 2I0.

The heating coil 220 heats up a thermo-sensitive element 230 of a time switch 23I, one side 23Ia of which is connected to the conductor 2I6i while the other side 23I b is carried by the thermo-sensitive element 230, the latter being connected through the conductor 2I9g to the coil of a solenoid 232 which is also connected to the conductor 2I9f.

About this time, the 20th form of the exposed group reaches the stripping position and in doing so the turntable which eiiects it operates one of the switches II5 tending to close a circuit from the, conductor 2I0a, through 2I01, switch II5, conductor 2I6i, coil 220 of relay H, conductor 2I0k, contacts 225, conductor 2I0l, limit switch I" and conductor 2I6m to the tefminal 23-Ibof the switch 23I. However, the circuit is open at contacts 23Ib and 23Ia and is prevented from closing until the said contacts close.

In the meantime, the thermo-sensitive element 230 is approaching the terminal 23Ia. As soon as it brings contact 23Ib into contact with the terminal 23Ia, the circuit for relay H is completed through contacts 223 and conductors 2I0h and 2I0. At the same time the element 230 closes the circuit through the coil 232, which opens the heater switch 228 and deenergizes the heating coil 229.

Closing of the contacts 2I3, 2H, and 2I5 lets current flow through lines x, y and z to motor I2 which immediately starts to raise the chamber I0.

Relay H locks itself in through contacts 221 which are shunted about switches H5. The interlock contacts 2I0 are opened, thus preventing closure of the lowering control circuit.

When the chamber I0 reaches its maximum high position it opens the limit switch ii! and opens the circuit to the relay H, whereby the contacts 2l3, 2, III, 221 and 2|! return to normal, stopping the motor l2 and setting up the circuit to the lowering relay L for the start of a new cycle of operations of the machine.

It will be seen that the cooling characteristic of the terminal time delay relay 200 must be such that the contacts 23la, 2llb do not open until the hoisting operation is completed, otherwise the circuit of the hoisting relay H would be opened before the completion of the hoisting operation.

The turntable 35 of the exposed truck 50 and series 25 of forms 24, 24 being stripped and loaded by this time has reached the stage where the last or 24th form of the series is in stripping position. At this point one of the pins H8 on the turntabl operates one of the switches I20 to open the circuit to the turntable motor 68, thereby stopping the turntable.

The operator then shifts the one truck from beneath the raised chamber Ill and pushes the newly loaded truck into alignment with the chamber, thereby closing one of the centering switches I03 and setting up the circuit to be closed by operating the manual switch I02, to lower the chamber Ill.

The steam valve circuit may be manually closed by actuation of the switch I 08a; and opened by actuation of manual switch lllla.

The chamber lowering circuit may be closed by actuation of the manual switch I02; and lowering of the chamber halted by actuation of the manual switch Hid.

The chamber raising circuit may be closed by actuation of the manual switch 5a; and raising of the chamber halted by actuation of the manual switch id.

The circuit for the turntable motor 66 may be rendered inactive at any time by actuation of a manual switch 235.

From the above it will be clear that the circuit involved in the present instance includes four essential portions namely:

(1) A chamber lowering portion; (2) Achamber hoisting portion; (3) A steam inlet and exhaust portion; and (4) A turntable actuation portion.

It will also be clear that portions 1 and 2 supra, are so related and of such interlocking character that conflicting currents cannot be passed to the chamber operating motor I: simultaneously.

It will also be clear that the inlet of steam to the chamber M will be controlled by the chamber itself being in correct position to receive the steam; and that the raising of thechamber will be controlled by the exhaust of the steam. from the chamber, thus avoiding injury to the operator or others in the vicinity of the machine.

It will also be clear that the exhaust of the steam and the raising of the chamber are primarily controlled by the operation of the 'turntable, while the operator is still stripping and reloading the exposed forms, thus effecting an overlapping of the time periods necessary for the individual operations and consequently re-- stances, will react to protect the machine and operator, etc.

In some instances it may be advisable to main-' tain the enclosing chamber in a fixed position, vertically, horizontally, or at an angle, with a group of acticle supporting forms mounted directly on a base arranged to mov with respect to the chamber from a position exposing the forms for stripping and loading to a position enclosing the forms within the chamber for treatment, and vice versa. In such cases the team inlet and exhaust may be connected to the chamber instead of the base and the base may be employed to operate the steam valve control as it moves into sealing relation to the open end of the chamber. Such modifications and others within the scope of the invention 'will readily be conceivable by one skilled in the art as a result of the foregoing disclosure.

I claim:

1. In a machine of the class described, a formsupporting member, a form-enclosing member, reversible power means including a motor for moving one of said members toward and away from the other of said members to enclose and expose the forms on said supporting member, a control circuit including manually operable means for initiating activity in one portion of said circuit to cause said motor to move the one member to effect enclosing of said forms, means for interrupting said activity when said forms are fully enclosed, automatic timing means for initiating activity in a second portion of said circuit to cause said motor to move said one member in an opposite direction to expose said forms, and means for interrupting said activity in said second portion of th circuit when said forms are fully exposed.

2. In a machine of the class described, a formsupporting member, a form-enclosing member, reversible power means including a motor for moving'one of said members toward and away from the other of said members to enclose and expose the forms on said supporting member, a

.. control circuit including manually operable means for initiating activity in one portion of said circuit to caus said motor to move the one member to eilect enclosing of said-forms, means for interrupting said activity when said forms are fully enclosed, automatic timing means for initiating activity in a second portion of said circuit to cause said motor to move said one member in an opposite direction to expose said forms, means for interrupting said activity in said second portion of the circuit when said forms are expose the forms on said supporting member, a

control circuit including manually operable means for initiating activity in one portion of said circult to cause said motor to move the cm member to efiect enclosing of said forms, means for interrupting said activity when said forms are fully enclosed, automatic timing means for initiatingactivity in a second portion of said circuit to cause said motor to move said one member in an opposite direction to expose said forms,

means for interrupting said activity in said second portion oi the circuit when said forms are iully exposed, and means operable by said one member when moving into form-enclosing position ior initiating activity in a third portion 01' said circuit ior admitting fluid to the interior of said form-enclosing member prior to interruption oi activities in the flrst portion oi the circuit.

4. In a machine oi the class described, a iormsupporting member, a form-enclosing member, reversible power means including a motor ior moving one oi said members toward and away ond portion oi the circuit when said iorms are fully exposed, means operable by said one member when moving into form-enclosing position ior initiating activity in a third portion oi said circuit for admitting fluid to the interior oi said form-enclosing member prior to interruption. oi activities in the flrst portion oi the circuit, and means for initiating reversal oi the activities in said third portion oi the circuit to exhaust said fluid from said iorm-enclosing member'prior to initiating said activities in said second portion oi said circuit.

5. In a machine or the class described, a formsupporting member, a form-enclosing member, reversible power means including a motor ior moving one oi said members toward and away irom the other oi said members to enclose and expose the forms on said supporting member, a control circuit including manually operable means for initiating activity in one portion of said circuit to cause said motor to move the one member to effect enclosing oi said forms, means for interrupting said activity when said forms are fully enclosed, means for initiating activity in a second portion of said circuit to cause said motor to move said one member in an opposite direction to expose said forms means for interrupting said activity in said second portion of the circuit when said forms are fully exposed, means ior initiating activity in a third portion oi said circuit for admitting fluid to the interior of said form-enclosing member prior to interruption of activities in the first portion oi the circuit, means ior initiating reversal of the activities in said third portion of the circuit to exhaust said fluid from said iorm-enclosing member prior to initiating said activities in said second portion of said circuit, and means included in said third portion oi said circuit for delaying the eflecting of said activities in said second portion of the circuit and inaugurated by said initiation oi said reversal of activities in the third portion or the circuit.

6. In a machine of the class described, a formsupporting member, a form-enclosing member, reversible power means including a motor for moving one of said members toward and away from the other of said members to enclose and expose the forms on said supporting member, a control circuit including manually operable means for initiating activity in one portion of said circuit to cause said motor to move the one member to effect enclosing oi said iorms, means ior interrupting said activity when said forms are iully enclosed. means for initiatin activity in a second portion oi said circuit to cause said motor to move said one member in an opposite direction to expose said iorms, means for interrupting said activity in said second portion oi the circuit when said forms are iully exposed, means for initiating activity in a third portion oi said circuit for admitting fluid to the interior oi said form-enclosing member prior to interruption oi activities in the first portion oi the circuit, means for initiating reversal oi the activities in said third portion of the circuit to exhaust 'said fluid from said form-enclosing member prior to initiating said activities in said second portion of said circuit, means included in said third portion oi said circuit for delaying the eflecting oi said activities in said second portion oi the circuit and inaugurated by said initiation of said reversal oi. activities in the third portion of the circuit, and a fourth portion of said circuit including a timing device ior operating the means ior initiating said reverse activities in said third portion oi said circuit, and said activity initiating means ior said second portion of said circuit in predetermined time relation to each other.

7. In a machine of the class described, a formsupporting member, a form-enclosing member, reversible power means including a motor ior moving one oi said members toward and away from the other oi said members to enclose and expose the forms on said supporting member, a control circuit including manually operable means for initiating activity in one portion of said circuit to cause said motor to move the one member to eflect enclosing of said iorms, means for interrupting said activity when said iorms are iully enclosed, means for initiating activity in a second portion of said circuit to cause said motor to move said one member in an opposite direction to expose said forms, means for interrupting said activity in said second portion of the circuit when said forms are fully exposed, means ior initiating activity in a third portion of said circuit for admitting fluid to the interior of said form-enclosing member prior to interruption of activities in the first portion oi the circuit, means for initiating reversal of the activities in said third portion of the circuit to exhaust said fluid from said form-enclosing member prior to initiating said activities in said second portion of said circuit, means included in said third portion of said circuit for delaying the efiecting of said activities in said second portion of the circuit and inaugurated by said initiation of said reversal oi activities in the third portion oi the circuit, a fourth portion of said circuit including a timing device for operating the means for initiating said reverse acreversible power means including a motor for until said fluid-sealing contact between said moving one of said members toward and away from the other of said members to enclose and expose the forms on said supporting member, a control circuit including manually operable means for initiating activity in one portion of said circuit to cause said motor to move the one member to effect enclosing of said forms, means for interrupting said activity when said forms are fully enclosed, means for initiating activity in a second portion of said circuit to cause said motor to move said one member in an opposite direction to expose said forms, means for interrupting said activity in said second portion of the circuit when said forms are fully exposed, means included in each of said circuit portions and operable by the motor influencing activity initiated therein to prevent such motor influencing activities in both of said circuit portions si ultaneously, means for initiating activity in a third portion of said circuit for admitting fluid to the interior of said form-enclosing member prior to interruption of activitiesin the first portion of the circuit, means for initiating reversal of the activities in said third portion of the circuit to exhaust said fluid from said form-enclosing member prior to initiating said activities in said second portion of said circuit, means included in said third portion of said circuit for delaying the effecting of said activities in said second portion of the circuit and inaugurated by said initiation of said reversal of activities in the third portion of the circuit, a fourth portion of said circuit including a timing device for operating the means for initiating said reverse activities in said third portion of said circuit and said activity initiating means for said second portion of said circuit in predetermined time relation to each other, manually operable means for initiating activity in said fourth portion of said circuit to start operation of said timing device, and means operable by said timing device for stopping the timing device activities in said fourth portion of the circuit subsequent to said timing device initiating activities in said second portion of said circuit.

9. In a machine of the class described, a formsupporting member, a form-enclosing member, reversible power means including a motor for moving one of said members toward and away from the other of said members to enclose.

and expose the forms on said supporting member, a control circuit including manually operable means for initiating activity in one portion of said circuit to cause said motor to move the one member to efiect enclosing of said forms, means included in said circuit for preventing or stopping said activities as a result of misalignment between said form-supporting member and said enclosing member, means for interrupting said activity when said forms are fully enclosed, means for initiating activity in a second portion of said circuit to cause said motor to move said one member in an opposite direction to expose said forms, and means for interrupting said activity in said second portion of the circuit when said forms are fully exposed.

10. In a machine of the class described, a formsupporting member, a form-enclosing member, motor driven means for moving one of said members into form-enclosing relation to and into fluid-sealing contact with the other of said members, and a circuit in which said motor is included comprising feed lines for said motor to aflord continuation of operation of the motor members is fully effected thereby, and an automatic circuit breaker in said circuit for opening said feed lines operable by overloading of said motor resulting from Jamming and stalling of the motor in eflecting said fluid-sealing contact between said members.

11. In a machine of the class described, a formsupporting member, a form-enclosing member, a supplemental carrier on said supporting member for one group of forms, a second supplemental carrier on said supporting member for a second group 01 forms, said carriers and the groups of forms thereon being selectively enclosable by said form enclosing member, one of said carriers and its forms being exposed during enclosure of the other carrier and its group of forms, means for effecting relative movements between said supporting and enclosing members to enclose one of said carriers and its group of forms, means for admitting and exhausting fluid to and from said form-enclosing member while enclosing one carrier and its forms, means rotatably supporting the exposed carrier on said form-supporting member, means for rotating said exposed carrier, a circuit including a motor for operating said enclosing member, a motor for operating said exposed carrier, and means on said carrier for controlling said circuit to initiate activities in said circuit for controlling predetermined actuations of said motors and said fluid admitting and exhausting means in predetermined order.

12. In a machine of the class described, a formsupporting member, a form-enclosing member, a supplemental carrier on said supporting member for one group of forms, a second supplemental carrier on said supporting member for a second group of forms, said carriers and the groups of forms thereon being selectively enclosable by said form-enclosing member, one of said carriers and its forms being exposed during enclosure of the other carrier and its group of forms, means for effecting relative movement between said supporting and enclosing members to enclose one of said carriers and its group of forms, means for admitting and exhausting fluid to and from said form-enclosing member while enclosing one carrier and its forms, means rotatably supporting the exposed carrier on said form-supporting member, means for rotating said exposed carrier, a circuit including a motor for operating said enclosing member, a motor for operating said exposed carrier, means on said carrier for controlling said circuit to initiate activities in said circuit for controlling predetermined actuations of said motors and said fluid admitting and exhausting means in predetermined order, and manually operable means included in said circuit for initiating operation of said motors to begin form-enclosing movement of said formenclosing member and rotation of said exp 1 carrier respectively.

13. In a machine of the class described, a form-supporting member, a form-enclosing memher, a supplemental carrier on said supporting member for one group of forms, a second supplemental carrier on said supporting member for a second group of forms, said carriers and the groups of forms thereon being selectively enclosable by said form-enclosing member, one of. said carriers and its forms being exposed during enclosure of the other carrier and its group of forms, means for effecting relative movement between said supporting and enclosing members to enclose one of said carriers and its group of forms, means for admitting and exhausting fluid to and from said form-enclosing member while enclosing one carrier and its forms, means rotatably supporting the exposed carrier on said formsupporting member, means for rotating said exposed carrier, a circuit including a motor for operating said enclosing member, a motor for operating said exposed carrier, means on said carrier for controlling said circuit to initiate activities in said circuit for controlling predetermined actuations of said motors and said fluid admitting and exhausting means in predetermined order, manually operable means included in said circuit for initiating operation of said motors to begin term-enclosing movement of said form-enclosing member and rotation oi said exposed carrier respectively, and means included in said circuit for stopping operations of the motor for said form-enclosing member at opposite ends respectively 01 its movements to form-enclosing and form-exposing positions with respect to said form-supporting member.

14. In a machine of the class described, a form-supporting member, a form-enclosing member, a supplemental carrier on said supporting member for one group of forms, a second supplemental carrier on said supporting member for a second group of forms, said carriers and the groups of forms thereon being selectively enclose.- ble by said form-enclosing member, one of said carriers and its forms being exposed during enclosure of the other carrier and its group of forms, means for effecting relative movement between said supporting and enclosing members to enclose one of said carriers and its group of forms, means for admitting and exhausting fluid to and from said form-enclosing member while enclosing one carrier and its forms, means rotatably supporting the exposed carrier on said form-supporting member, means for rotating said exposed carrier, a circuit including a motor for operating said enclosing member, a motor for operating said exposed carrier, means on said carrier for controlling said circuit to initiate activities in said circuit for controlling predetermined actuations of said motors and said fluid admitting and exhausting means in predetermined order, manually operable means included in said circuit for initiating operation of said motors to begin formenclosing movement of said form-enclosing member and rotation of said exposed carrier respectively, and means included in said circuit for rendering the manual starting means for the form-enclosing member motor ineffective under 'misalignment of or absence from alignment with said enclosing member of the form carrier selected to be enclosed thereby.

15. In a machine of the class described, a form-supporting member, a form-enclosing member, a supplemental carrier on said supporting member for one group of forms, a second supplemental carrier on said supporting member for a second group of forms, said carriers and the azeaou groups of forms thereon being selectively enclosable by said form enclosing member, one of said carriers and its forms being exposed during enclosure of the other carrier and its group of forms, means for effecting relative movement between said supporting and enclosing members to enclose one of said carriers and its group of forms, means for admitting and exhausting fluid to and from said form-enclosing member while enclosing one carrier and its forms, means rotatably supporting the exposed carrier on said tormsupporting member. means for rotating said exposed carrier, a circuit including a motor for operating said enclosing member, a motor for operating said exposed carrier, means on said carrier for controlling said circuit to initiate activlties in said circuit for controlling predetermined actuations of said motors and said fluid admitting and exhausting means in predetermined order, manually operable means included in said circuit for initiating operation of said motors to begin form-enclosing movement of said form-enclosing member and rotation of said exposed carrier respectively, means included in said circuit for rendering the manual starting means for the form-enclosing member motor ineffective under m salignment of or absence from alignment with said enclosing member of the form carrier selected to be enclosed thereby, and manually operable means in said circuit for interrupting initiated activities in said circuit.

16. In a machine of the class described, a form-supporting member, a form-enclosing member, reversible power means including a motor for moving one of said members toward and away from the other oi said members to enclose and expose the forms on said supporting member, means for admitting and exhausting fluid to and from the interior of said form-enclosing member when in form-enclosing relation to said formsupporting member, a control circuit including manually operable means for initiating activity in one portion of said circuit to cause said motor to move the one member to effect enclosing of said forms, means for interrupting said activity when said forms are fully enclosed, automatic timing means for initiating activity in a second portion of said circuit to cause said motor to move said one member in an opposite direction to expose said forrns and to exhaust fluid from said form-enclosing member, means for interrupting said activity in said second portion of the circuit when said forms are fully exposed, and means included in said circuit independent of said automatic timing means for delaying operation of the motor for the form-enclosing member to move said member into form -exposing position as initiated by said automatic timing means for that purpose subsequent to prior initiation of activities for exhausting fluid from said form-enclosing member by said automatic timing means for that purpose.

WALTER M. SCHWARTZ. 

